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Finding the Fourth Proportional to 66,638.96, 91,966.20 and 38,351.60

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Solution

The fourth proportional to 66,638.96, 91,966.20 and 38,351.60 is: 52,927.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,638.96 : 91,966.20 = 38,351.60 : x
  2. Step 2: Convert to fraction form
    66,638.96/91,966.20 = 38,351.60/x
  3. Step 3: Cross multiply
    66,638.96x = 91,966.20 × 38,351.60
  4. Step 4: Simplify right side
    66,638.96x = 3,527,050,915.92
  5. Step 5: Solve for x
    x = 3,527,050,915.92/66,638.96
  6. Step 6: Final answer
    x = 52,927.76

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.